﻿// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System.ComponentModel;

namespace System.Windows.Forms;

/// <summary>
///  CategoryAttribute that can access WinForms localized strings.
/// </summary>
[AttributeUsage(AttributeTargets.All)]
internal sealed class WinCategoryAttribute : CategoryAttribute
{
    /// <summary>
    ///  Initializes a new instance of the <see cref="CategoryAttribute"/> class.
    /// </summary>
    public WinCategoryAttribute(string category) : base(category)
    {
    }

    /// <summary>
    ///  This method is called the first time the category property
    ///  is accessed.  It provides a way to lookup a localized string for
    ///  the given category.  Classes may override this to add their
    ///  own localized names to categories.  If a localized string is
    ///  available for the given value, the method should return it.
    ///  Otherwise, it should return null.
    /// </summary>
    protected override string GetLocalizedString(string value)
    {
        string? localizedValue = base.GetLocalizedString(value);
        localizedValue ??= (string?)GetSRObject("WinFormsCategory" + value);

        // This attribute is internal, and we should never have a missing resource string.
        Debug.Assert(localizedValue is not null, $"All Windows Forms category attributes should have localized strings.  Category '{value}' not found.");
        return localizedValue;
    }

    private static object? GetSRObject(string name)
    {
        object? resourceObject = null;
        try
        {
            resourceObject = SR.ResourceManager.GetObject(name);
        }
        catch (Resources.MissingManifestResourceException)
        {
        }

        return resourceObject;
    }
}
